Cross-linked main-chain polybenzoxazine nanofibers by photo and thermal curing; stable at high temperatures and harsh acidic conditions

Cross-linked main-chain polybenzoxazine nanofibers by photo and thermal curing; stable at high... In this study, for the first time cross-linking of linear aliphatic diamine-based main-chain polybenzoxazine (MCPBz) electrospun nanofibers were accomplished by two-step approach consisting of photo and thermal curing. Initially, two novel MCPBz resins which comprise of a benzophenone unit in the polymer main-chain were synthesized and uniform MCPBz nanofibers were produced by electrospinning. At first step, photo curing was performed by free radical polymerization initiated by UV-light and thermal stability of nanofibers was enhanced. At second step, thermal curing was carried out at different temperatures (150–225 °C) and ring opening and cross-linking of benzoxazine groups in the fiber structure were achieved. After two-step curing, cross-linked MCPBz nanofibers were obtained as free-standing material with good mechanical properties. Moreover, it was shown that these two cross-linked MCPBz nanofibers were structurally stable and maintained their fibrous morphology at high temperatures (400 °C), in good solvents (chloroform, DMF, 1,4-dioxane, DMAc, THF) and highly concentrated strong acids (HCl, HNO3, H2SO4). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Elsevier

Cross-linked main-chain polybenzoxazine nanofibers by photo and thermal curing; stable at high temperatures and harsh acidic conditions

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0032-3861
D.O.I.
10.1016/j.polymer.2015.12.026
Publisher site
See Article on Publisher Site

Abstract

In this study, for the first time cross-linking of linear aliphatic diamine-based main-chain polybenzoxazine (MCPBz) electrospun nanofibers were accomplished by two-step approach consisting of photo and thermal curing. Initially, two novel MCPBz resins which comprise of a benzophenone unit in the polymer main-chain were synthesized and uniform MCPBz nanofibers were produced by electrospinning. At first step, photo curing was performed by free radical polymerization initiated by UV-light and thermal stability of nanofibers was enhanced. At second step, thermal curing was carried out at different temperatures (150–225 °C) and ring opening and cross-linking of benzoxazine groups in the fiber structure were achieved. After two-step curing, cross-linked MCPBz nanofibers were obtained as free-standing material with good mechanical properties. Moreover, it was shown that these two cross-linked MCPBz nanofibers were structurally stable and maintained their fibrous morphology at high temperatures (400 °C), in good solvents (chloroform, DMF, 1,4-dioxane, DMAc, THF) and highly concentrated strong acids (HCl, HNO3, H2SO4).

Journal

PolymerElsevier

Published: Feb 10, 2016

References

  • Polym. Degrad. Stabil.
    Zhang, H.; Gu, W.; Zhu, R.; Ran, Q.; Gu, Y.
  • Polym. Chem.
    Baranek, D.; Kendrick, L.L.; Narayanan, J.; Tyson, G.E.; Wand, S.; Patton, D.L.
  • Polym. Chem.
    Baranek, A.D.; Kendrick, L.L.; Narayanan, J.; Tyson, G.E.; Wand, S.; Patton, D.L.

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